On the Combined Operational Load Bearing External Resistance Treadmill (COLBERT), also known as the Treadmill 2, astronaut Luca Parmitano works out.Photo by NASAPost to Facebook Post to Twitter

On the Combined Operational Load Bearing External Resistance Treadmill (COLBERT), also known as the Treadmill 2, astronaut Luca Parmitano works out.Photo by NASAPost to Facebook Post to Twitter
